my solutions to the ruby koans path

Author: atzorvas

.path_progress

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+0,5,5,6,8,8,11,15,18,21,23,24,31,38,39,39,39,40,41,41,42,43,45,46,48,49,50,50,50,52,54,56,57,60,65,66,70,73,74,75,76,77,78,78,78,79,81,83,83,83,84,85,86,86,86,86,87,88,88,88,89,89,91,91,92,93,94,94,96,97,97,97,98,98,101,102,102,104,105,106,107,110,113,113,113,113,113,113,114,115,120,124,126,127,129,131,129,131,135,145,146,150,150,153,154,154,154,155,158,159,160,165,165,168,168,168,171,177,177,178,182,187,190,183,189,190,183,189,189,190,183,183,190,183,190,189,189,190,187,187,190,187,187,192,197,199,205,205,206,209,210,226,227,228,229,231,234,235,238,239,239,239,242,245,247,253,256,257,258,259,259,260,260,261,263,276,276,276,277,279

GREED_RULES.txt

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+= Playing Greed
+
+Greed is a dice game played among 2 or more players, using 5
+six-sided dice.
+
+== Playing Greed
+
+Each player takes a turn consisting of one or more rolls of the dice.
+On the first roll of the game, a player rolls all five dice which are
+scored according to the following:
+
+  Three 1's => 1000 points
+  Three 6's =>  600 points
+  Three 5's =>  500 points
+  Three 4's =>  400 points
+  Three 3's =>  300 points
+  Three 2's =>  200 points
+  One   1   =>  100 points
+  One   5   =>   50 points
+
+A single die can only be counted once in each roll.  For example,
+a "5" can only count as part of a triplet (contributing to the 500
+points) or as a single 50 points, but not both in the same roll.
+
+Example Scoring
+
+   Throw       Score
+   ---------   ------------------
+   5 1 3 4 1   50 + 2 * 100 = 250
+   1 1 1 3 1   1000 + 100 = 1100
+   2 4 4 5 4   400 + 50 = 450
+
+The dice not contributing to the score are called the non-scoring
+dice.  "3" and "4" are non-scoring dice in the first example.  "3" is
+a non-scoring die in the second, and "2" is a non-score die in the
+final example.
+
+After a player rolls and the score is calculated, the scoring dice are
+removed and the player has the option of rolling again using only the
+non-scoring dice. If all of the thrown dice are scoring, then the
+player may roll all 5 dice in the next roll.
+
+The player may continue to roll as long as each roll scores points. If
+a roll has zero points, then the player loses not only their turn, but
+also accumulated score for that turn. If a player decides to stop
+rolling before rolling a zero-point roll, then the accumulated points
+for the turn is added to his total score.
+
+== Getting "In The Game"
+
+Before a player is allowed to accumulate points, they must get at
+least 300 points in a single turn. Once they have achieved 300 points
+in a single turn, the points earned in that turn and each following
+turn will be counted toward their total score.
+
+== End Game
+
+Once a player reaches 3000 (or more) points, the game enters the final
+round where each of the other players gets one more turn. The winner
+is the player with the highest score after the final round.
+
+== References
+
+Greed is described on Wikipedia at
+http://en.wikipedia.org/wiki/Greed_(dice_game), however the rules are
+a bit different from the rules given here.

README.rdoc

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+= Neo Ruby Koans
+
+The Ruby Koans walk you along the path to enlightenment in order to learn Ruby.
+The goal is to learn the Ruby language, syntax, structure, and some common
+functions and libraries. We also teach you culture by basing the koans on tests.
+Testing is not just something we pay lip service to, but something we
+live.  Testing is essential in your quest to learn and do great things in Ruby.
+
+== The Structure
+
+The koans are broken out into areas by file, hashes are covered in +about_hashes.rb+,
+modules are introduced in +about_modules.rb+, <em>etc</em>.  They are presented in
+order in the +path_to_enlightenment.rb+ file.
+
+Each koan builds up your knowledge of Ruby and builds upon itself. It will stop at
+the first place you need to correct.
+
+Some koans simply need to have the correct answer substituted for an incorrect one.
+Some, however, require you to supply your own answer.  If you see the method +__+ (a
+double underscore) listed, it is a hint to you to supply your own code in order to
+make it work correctly.
+
+== Installing Ruby
+
+If you do not have Ruby setup, please visit http://ruby-lang.org/en/downloads/ for
+operating specific instructions.  In order to run the koans you need +ruby+ and
++rake+ installed. To check your installations simply type:
+
+*nix platforms from any terminal window:
+
+   [~] $ ruby --version
+   [~] $ rake --version
+
+Windows from the command prompt (+cmd.exe+)
+
+   c:\ruby --version
+   c:\rake --version
+
+If you don't have +rake+ installed, just run <code>gem install rake</code>
+
+Any response for Ruby with a version number greater than 1.8 is fine (should be
+around 1.8.6 or more). Any version of +rake+ will do.
+
+== Generating the Koans
+
+A fresh checkout will not include the koans, you will need to generate
+them.
+
+    [ruby_koans] $ rake gen                       # generates the koans directory
+
+If you need to regenerate the koans, thus wiping your current `koans`,
+
+    [ruby_koans] $ rake regen                     # regenerates the koans directory, wiping the original
+
+== The Path To Enlightenment
+
+You can run the tests through +rake+ or by calling the file itself (+rake+ is the
+recommended way to run them as we might build more functionality into this task).
+
+*nix platforms, from the +ruby_koans+ directory
+
+    [ruby_koans] $ rake                           # runs the default target :walk_the_path
+    [ruby_koans] $ ruby path_to_enlightenment.rb  # simply call the file directly
+
+Windows is the same thing
+
+    c:\ruby_koans\rake                             # runs the default target :walk_the_path
+    c:\ruby_koans\ruby path_to_enlightenment.rb    # simply call the file directly
+
+=== Red, Green, Refactor
+
+In test-driven development the mantra has always been <em>red, green, refactor</em>.
+Write a failing test and run it (<em>red</em>), make the test pass (<em>green</em>),
+then look at the code and consider if you can make it any better (<em>refactor</em>).
+
+While walking the path to Ruby enlightenment you will need to run the koan and
+see it fail (<em>red</em>), make the test pass (<em>green</em>), then take a moment
+and reflect upon the test to see what it is teaching you and improve the code to
+better communicate its intent (<em>refactor</em>).
+
+The very first time you run the koans you will see the following output:
+
+    [ ruby_koans ] $ rake
+    (in /Users/person/dev/ruby_koans)
+    /usr/bin/ruby1.8 path_to_enlightenment.rb
+
+    AboutAsserts#test_assert_truth has damaged your karma.
+
+    The Master says:
+    You have not yet reached enlightenment.
+
+    The answers you seek...
+    <false> is not true.
+
+    Please meditate on the following code:
+    ./about_asserts.rb:10:in `test_assert_truth'
+    path_to_enlightenment.rb:38:in `each_with_index'
+    path_to_enlightenment.rb:38
+
+    mountains are merely mountains
+    your path thus far [X_________________________________________________] 0/280
+
+You have come to your first stage. Notice it is telling you where to look for
+the first solution:
+
+    Please meditate on the following code:
+    ./about_asserts.rb:10:in `test_assert_truth'
+    path_to_enlightenment.rb:38:in `each_with_index'
+    path_to_enlightenment.rb:38
+
+Open the +about_asserts.rb+ file and look at the first test:
+
+    # We shall contemplate truth by testing reality, via asserts.
+    def test_assert_truth
+      assert false                # This should be true
+    end
+
+Change the +false+ to +true+ and re-run the test.  After you are
+done, think about what you are learning.  In this case, ignore everything except
+the method name (+test_assert_truth+) and the parts inside the method (everything
+before the +end+).
+
+In this case the goal is for you to see that if you pass a value to the +assert+
+method, it will either ensure it is +true+ and continue on, or fail if
+the statement is +false+.
+
+=== Running the Koans automatically
+
+<em>This section is optional.</em>
+
+Normally the path to enlightenment looks like this:
+
+    cd ruby_koans
+    rake
+    # edit
+    rake
+    # edit
+    rake
+    # etc
+
+If you prefer, you can keep the koans running in the background so that after you
+make a change in your editor, the koans will immediately run again. This will
+hopefully keep your focus on learning Ruby instead of on the command line.
+
+Install the Ruby gem (library) called +watchr+ and then ask it to
+"watch" the koans for changes:
+
+    cd ruby_koans
+    rake
+    # decide to run rake automatically from now on as you edit
+    gem install watchr
+    watchr ./koans/koans.watchr
+
+== Inspiration
+
+A special thanks to Mike Clark and Ara Howard for inspiring this
+project.  Mike Clark wrote an excellent blog post about learning Ruby
+through unit testing. This sparked an idea that has taken a bit to
+solidify, that of bringing new rubyists into the community through
+testing. Ara Howard then gave us the idea for the Koans in his ruby
+quiz entry on Meta Koans (a must for any rubyist wanting to improve
+their skills).  Also, "The Little Lisper" taught us all the value of
+the short questions/simple answers style of learning.
+
+Mike Clark's post ::  http://www.clarkware.com/cgi/blosxom/2005/03/18
+Meta Koans        ::  http://rubyquiz.com/quiz67.html
+The Little Lisper ::  http://www.amazon.com/Little-LISPer-Third-Daniel-Friedman/dp/0023397632
+
+== Other Resources
+
+The Ruby Language               ::  http://ruby-lang.org
+Try Ruby in your browser        ::  http://tryruby.org
+
+Dave Thomas' introduction to Ruby Programming Ruby (the Pick Axe) ::  http://pragprog.com/titles/ruby/programming-ruby
+
+Brian Marick's fantastic guide for beginners Everyday Scripting with Ruby    ::  http://pragprog.com/titles/bmsft/everyday-scripting-with-ruby
+
+= Other stuff
+
+Author         :: Jim Weirich <[email protected]>
+Author         :: Joe O'Brien <[email protected]>
+Issue Tracker  :: http://www.pivotaltracker.com/projects/48111
+Requires       :: Ruby 1.8.x or later and Rake (any recent version)
+
+= License
+
+http://i.creativecommons.org/l/by-nc-sa/3.0/88x31.png
+
+RubyKoans is released under a Creative Commons,
+Attribution-NonCommercial-ShareAlike, Version 3.0
+(http://creativecommons.org/licenses/by-nc-sa/3.0/) License.

Rakefile

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+#!/usr/bin/env ruby
+# -*- ruby -*-
+
+require 'rake/clean'
+require 'rake/testtask'
+
+task :default => :test
+
+task :test do
+  ruby 'path_to_enlightenment.rb'
+end
+

about_array_assignment.rb

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+require File.expand_path(File.dirname(__FILE__) + '/neo')
+
+class AboutArrayAssignment < Neo::Koan
+  def test_non_parallel_assignment
+    names = ["John", "Smith"]
+    assert_equal ["John", "Smith"], names
+  end
+
+  def test_parallel_assignments
+    first_name, last_name = ["John", "Smith"]
+    assert_equal "John", first_name
+    assert_equal "Smith", last_name
+  end
+
+  def test_parallel_assignments_with_extra_values
+    first_name, last_name = ["John", "Smith", "III"]
+    assert_equal "John", first_name
+    assert_equal "Smith", last_name
+  end
+
+  def test_parallel_assignments_with_splat_operator
+    first_name, *last_name = ["John", "Smith", "III"]
+    assert_equal "John", first_name
+    assert_equal ["Smith", "III"], last_name
+  end
+
+  def test_parallel_assignments_with_too_few_variables
+    first_name, last_name = ["Cher"]
+    assert_equal "Cher", first_name
+    assert_equal nil, last_name
+  end
+
+  def test_parallel_assignments_with_subarrays
+    first_name, last_name = [["Willie", "Rae"], "Johnson"]
+    assert_equal ["Willie", "Rae"], first_name
+    assert_equal "Johnson", last_name
+  end
+
+  def test_parallel_assignment_with_one_variable
+    first_name, = ["John", "Smith"]
+    assert_equal "John", first_name
+  end
+
+  def test_swapping_with_parallel_assignment
+    first_name = "Roy"
+    last_name = "Rob"
+    first_name, last_name = last_name, first_name
+    assert_equal "Rob", first_name
+    assert_equal "Roy", last_name
+  end
+end